// license:BSD-3-Clause
// copyright-holders:Uki
/*******************************************************************************
XX Mission (c) 1986 UPL
Video hardware driver by Uki
31/Mar/2001 -
*******************************************************************************/
#include "emu.h"
#include "includes/xxmissio.h"
WRITE8_MEMBER(xxmissio_state::scroll_x_w)
{
m_xscroll = data;
}
WRITE8_MEMBER(xxmissio_state::scroll_y_w)
{
m_yscroll = data;
}
WRITE8_MEMBER(xxmissio_state::flipscreen_w)
{
m_flipscreen = data & 0x01;
}
WRITE8_MEMBER(xxmissio_state::bgram_w)
{
int x = (offset + (m_xscroll >> 3)) & 0x1f;
offset = (offset & 0x7e0) | x;
m_bgram[offset] = data;
}
READ8_MEMBER(xxmissio_state::bgram_r)
{
int x = (offset + (m_xscroll >> 3)) & 0x1f;
offset = (offset & 0x7e0) | x;
return m_bgram[offset];
}
/****************************************************************************/
TILE_GET_INFO_MEMBER(xxmissio_state::get_bg_tile_info)
{
int code = ((m_bgram[0x400 | tile_index] & 0xc0) << 2) | m_bgram[0x000 | tile_index];
int color = m_bgram[0x400 | tile_index] & 0x0f;
SET_TILE_INFO_MEMBER(2, code, color, 0);
}
TILE_GET_INFO_MEMBER(xxmissio_state::get_fg_tile_info)
{
int code = m_fgram[0x000 | tile_index];
int color = m_fgram[0x400 | tile_index] & 0x07;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
void xxmissio_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(xxmissio_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 16, 8, 32, 32);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(xxmissio_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 16, 8, 32, 32);
m_bg_tilemap->set_scroll_cols(1);
m_bg_tilemap->set_scroll_rows(1);
m_bg_tilemap->set_scrolldx(2, 12);
m_fg_tilemap->set_transparent_pen(0);
save_item(NAME(m_xscroll));
save_item(NAME(m_yscroll));
save_item(NAME(m_flipscreen));
}
PALETTE_DECODER_MEMBER( xxmissio_state, BBGGRRII )
{
uint8_t i = raw & 3;
uint8_t r = (raw >> 0) & 0x0c;
uint8_t g = (raw >> 2) & 0x0c;
uint8_t b = (raw >> 4) & 0x0c;
return rgb_t(pal4bit(r | i), pal4bit(g | i), pal4bit(b | i));
}
void xxmissio_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect, gfx_element *gfx)
{
int offs;
int chr,col;
int x,y,px,py,fx,fy;
for (offs=0; offs<0x800; offs +=0x20)
{
chr = m_spriteram[offs];
col = m_spriteram[offs+3];
fx = ((col & 0x10) >> 4) ^ m_flipscreen;
fy = ((col & 0x20) >> 5) ^ m_flipscreen;
x = m_spriteram[offs+1]*2;
y = m_spriteram[offs+2];
chr = chr + ((col & 0x40) << 2);
col = col & 0x07;
if (m_flipscreen==0)
{
px = x-8;
py = y;
}
else
{
px = 480-x-6;
py = 240-y;
}
px &= 0x1ff;
gfx->transpen(bitmap,cliprect,
chr,
col,
fx,fy,
px,py,0);
if (px>0x1e0)
gfx->transpen(bitmap,cliprect,
chr,
col,
fx,fy,
px-0x200,py,0);
}
}
uint32_t xxmissio_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
machine().tilemap().mark_all_dirty();
machine().tilemap().set_flip_all(m_flipscreen ? TILEMAP_FLIPX | TILEMAP_FLIPY : 0);
m_bg_tilemap->set_scrollx(0, m_xscroll * 2);
m_bg_tilemap->set_scrolly(0, m_yscroll);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect, m_gfxdecode->gfx(1));
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}